/**
 * File    : TableStructureEventDispatcher.java
 * Created : 27 nov. 2003
 * By      : Olivier
 *
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details ( see the LICENSE file ).
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.aelitis.azureus.ui.common.table;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.gudy.azureus2.core3.util.AEMonitor;
import org.gudy.azureus2.core3.util.Debug;

import com.aelitis.azureus.core.util.CopyOnWriteList;

/**
 * @author Olivier
 * 
 */
public class TableStructureEventDispatcher implements TableStructureModificationListener {

    private static Map<String, TableStructureEventDispatcher> instances = new HashMap<String, TableStructureEventDispatcher>();

    private static AEMonitor class_mon = new AEMonitor("TableStructureEventDispatcher:class");

    private CopyOnWriteList listeners;

    private AEMonitor listeners_mon = new AEMonitor("TableStructureEventDispatcher:L");

    /**
	 * 
	 */
    private TableStructureEventDispatcher() {
        listeners = new CopyOnWriteList(2);
    }

    public static TableStructureEventDispatcher getInstance(String tableID) {
        try {
            class_mon.enter();

            TableStructureEventDispatcher instance = instances.get(tableID);
            if (instance == null) {
                instance = new TableStructureEventDispatcher();
                instances.put(tableID, instance);
            }
            return instance;
        } finally {

            class_mon.exit();
        }
    }

    public void addListener(TableStructureModificationListener listener) {
        try {
            listeners_mon.enter();

            if (!listeners.contains(listener)) {
                listeners.add(listener);
            }

        } finally {

            listeners_mon.exit();
        }
    }

    public void removeListener(TableStructureModificationListener listener) {
        try {
            listeners_mon.enter();

            listeners.remove(listener);
        } finally {

            listeners_mon.exit();
        }
    }

    public Set<Class<?>> prepareForTableReset() {
        Set<Class<?>> dataSourceTypes = new HashSet<Class<?>>();

        Iterator iter = listeners.iterator();
        while (iter.hasNext()) {
            TableStructureModificationListener listener = (TableStructureModificationListener) iter.next();
            try {
                dataSourceTypes.addAll(listener.prepareForTableReset());
            } catch (Throwable e) {
                Debug.printStackTrace(e);
            }
        }

        return (dataSourceTypes);
    }

    public void tableStructureChanged(boolean columnAddedOrRemoved, Class forPluginDataSourceType) {

        Iterator iter = listeners.iterator();
        while (iter.hasNext()) {
            TableStructureModificationListener listener = (TableStructureModificationListener) iter.next();
            try {
                listener.tableStructureChanged(columnAddedOrRemoved, forPluginDataSourceType);
            } catch (Throwable e) {
                Debug.printStackTrace(e);
            }
        }
    }

    public void columnSizeChanged(TableColumnCore tableColumn, int diff) {
        Iterator iter = listeners.iterator();
        while (iter.hasNext()) {
            TableStructureModificationListener listener = (TableStructureModificationListener) iter.next();
            listener.columnSizeChanged(tableColumn, diff);
        }
    }

    public void columnInvalidate(TableColumnCore tableColumn) {

        Iterator iter = listeners.iterator();
        while (iter.hasNext()) {
            TableStructureModificationListener listener = (TableStructureModificationListener) iter.next();
            listener.columnInvalidate(tableColumn);
        }

    }

    public void cellInvalidate(TableColumnCore tableColumn, Object data_source) {

        Iterator iter = listeners.iterator();
        while (iter.hasNext()) {
            TableStructureModificationListener listener = (TableStructureModificationListener) iter.next();
            listener.cellInvalidate(tableColumn, data_source);
        }

    }

    public void columnOrderChanged(int[] iPositions) {

        Iterator iter = listeners.iterator();
        while (iter.hasNext()) {
            TableStructureModificationListener listener = (TableStructureModificationListener) iter.next();
            listener.columnOrderChanged(iPositions);
        }
    }
}
